Question

Retinal is:

• A. sensitive to light energy
• B. a part of rhodopsin
• C. found in both rods and cones
• D. all of the above

Answer 1

Answer: (D)

• The retina is the innermost, light-sensitive layer of tissue of the eye of most vertebrates and some molluscs.
• The primary light-sensing cells in the retina are the photoreceptor cells, which are of two types: rods and cones.
• Rods function mainly in dim light and provide black-and-white vision. Cones function in well-lit conditions and are responsible for the perception of colour.
• Rhodopsin is a biological pigment found in the rods of the retina.
• Rhodopsin is extremely sensitive to light, and thus enables vision in low-light conditions. Hence, retinal is sensitive to light energy, a part of rhodopsin and found in both rods and cones.

So, the correct answer is 'all the above'.